Electric lamp shade



Feb. 28, 1933. H. HERTZ 1,899,272

ELECTRIC LAMP SHADE Filed Oct. 11,1950

by'alm am Herz z Patented Feb. 28, 1933? UNITED STA E HJALMAR HERTZ, 0F ELIZABETH; NEW JERSEY, 'ASSIGNOR TO'THE SINGER MANU- JERSEY Application filed October 11,

This invention relates to shades for electric. lighting devices, and more particularly'to shades for sewing machine lighting devices. The invention has for an object to'overcome excessive heating of such a shade without sacrifice of its reflecting properties.

' device. Fig. 3 is a section onthe line 3-4),

Fig. 1. Fig. 4: is a section on theline 44, Fig. 1-. Fig. 5 is an end view of the shade insert. Fig. 6 is a perspective view of the shade-supporting socket, andFig.v 7 is a disassembled perspective view of the shade elements. v

In the device illustrated, 1 represents the socket-shell which encloses the usual socketinsides including the pin-terminals 2. The socket-shell is molded preferably'from phenolic condensation material andincludes the tubular extension 3 into which the base 4: of

.- end-wall 9 ofthe shank 7 and retain the op-' the lamp 5 is inserted in the usual manner.-

The lamp-shade is non-metallic and is preferably molded from phenolic condensation material. It comprises a semi-cylindrical or inverted trough-shaped shell 6 formed at one endwith a reduced tubular shank 7 which snugly fits upon the socket-extension 3. a The extension 3 is provided withthe outwardly extending retaining pins 8 which engage the posite end-wall of the shank 7 in engagement with the shoulder 10 of the socket-shell 1.}

The shank 7 is formedwith the innerlongitudinal grooves 11 which clear the pins 8 during the application of'the shade 6 to the socket; the shade 6 being rotated relative to l the socket-shell, after it isapplied to the lat-.

shank 7 ofthe shade 6; the grooves 11 constitutingrecessesto receive the tongues 13. The liner 12 is formed with theoutwardly Y tion currents which carry the heat away from FACTURING COMPANY, OF ELIZABETH, NEW JERSEY, CORPORATIONI OF ELECTRIC LAMP sminn 1930, Serial No. 487,933.

ten-to'jcarry the grooves 11- out ofregister with the pins 8.

ofthe-application of Kenneth Perkins, Serial No. 463,592, filed June .25, 1930. According to the present invention there is interposed .a .thin sheet-metal. reflecting liner 12 which-is of the same inverted trough shape as the non-metallic shade 6 and is formed at its base-end with inwardly bent, cars 13, terminating in the parallel tongues; 13 removably fitted to the grooves 11 in the e Xtendingindentations l4 and thumb-catch 15 which engage the inner wall of the shade 6 andhold the liner 12 spaced inwardly from the latter,

This separation provides; an

inverted trough-shaped air-gap 16 which is open along-its; lower edges and at one endto provide a free circulation of air by convecthe liner12. There are, in, the present.in--

'stance,.;two factors acting concurrently to control-.-,and direct the dissipation of heat from the lamp and hot reflector 12; one of these factors is the free circulatoryair-gap and the other is, the nonmetallic outer shade.

These factors operate in combination to lead or, direct the heat stream into the free air current between the reflector and the outer shade, whereit is desired that the heat shall go, and repel or block the heat stream from lateral flow through thewall of the outer shade, whereit is desired'that the heat shall not go.

. It will be understood. that the liner 12 serves to lock the shade 6 against removal .lfrorn'the socket-extension?) and that the'liner;

12;,1nust be; removed prior; tofreinoval' of the shadeyfi, from the socket-extension. The V bright metal surface .of the liner 12 acts as a'n-effective reflector of light and; being within-the molded shade 6, is not seen and ndoes not detract from. the unitary, neat and inconspicuous appearance of the molded sock et and shade assembly,

Having thus set forth the nature of the invention, what I claim herein is 1. The combination with an electric lamp and lamp-socket, of a lamp-shade having a tubular shank fitted to. said socket, said shank having recesses extending longitudinally thereof, and a thin sheet-metal liner disposed within and in spaced relation to said shade and having tongues at one end entering said recesses.

2. A lamp-shade liner comprising a thin sheet-metal body of semi-cylindrical form having at one end a plurality of inwardly bent ears terminating in tongues, said tongues being substantially parallel to one another.

3. A lamp-shade liner comprising a thin i sheet-metal body of semi-cylindrical form having at one end a plurality of inwardly bent ears terminating in tongues, said tongues being substantially parallel to one another, the body of said shade being formed with outwardly extending indentations.

4. V The combination with an electric lampsocket and inverted-trough-shaped lampshade assembly, of an inverted-troughshaped sheet-metal liner disposed within and spaced from said lamp-shade and slidably connected at one shade assembly.

5. The combination with an-electric lampsocket and inverted.trough-shaped lampshade assembly, of an inverted-trough shaped reflector nested within and spaced from said lamp-shade and supported at one end only. I

" 6. The combination with an electric lampsocket and an inverted-trough-shaped lamp,- shade of molded phenolic condensation material, of an inverted-trough-shaped sheetmetal reflector disposed within and spaced from said lamp-shade to provide an airspace of inverted-trough-shape, said airspace being open along its lower edges and at one end. i

7. The combination with electric lamp and lamp-socket members, of anon-metallic lamp-shade having a metallic reflecting liner spaced inwardly therefrom and disposed between said lamp-shade and lamp to provide a free air-gap, which is open to the external atmosphere for lngress of cool an and egress of heated air. a

8. The combination with horizontally disposed electric lamp and lamp-socket members, of an inverted trough-shaped non-metallic lamp-shade having a similarly. shaped metallic reflecting liner spaced inwardly therefrom to provide an air-gap open along the lower edges and at one endof the shade;

In testimony whereof I have signed my name to this specification.

HJALMAR HERTZ.

end to said socket and 

